Available officers - 9024 (20)

Save the game with 90 or more officers unlocked.

Achievement Guide for Available officers - 90

Achievement won on 15 Mar 09TA Score for this game: 1,609
Posted on 15 March 09 at 22:25

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This one is technically ridiculously easy.

To get it, beat almost every single story mode map. The reason I say almost is I believe story mode gives every character but one for the game, and there's over 90 character (I'd guess 94) so you'll get it just before you finish the story mode of the game.